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Updated: Feb 12, 2026

Application of DNA Fingerprinting using the D1S80 Locus in Lab Classes
Published on: July 17, 2021
[Comparison of Bacteria ERIC-PCR Fingerprints of Index Fingers and Contactants]
Y T Liu1,2, D M Sun1, S P Shi2
1East China University of Political Science and Law, Shanghai 200043, China.
Objectives:
To explore the bacteria relevance between index fingers and contactant' surfaces (mobile phone touch screen and desktop of personal office table).
Methods:
Bacteria were collected from the index fingers, mobile phone touch screen and desktop of personal office table of 10 volunteers. Enterobacterial repetitive intergenic consensus (ERIC)-PCR fingerprint was established by PCR amplification technique of metagenome.
Results:
There were 7 volunteers' ERIC-PCR fingerprints of index fingers matched that took from the mobile phone touch screens, and different from each other. There were 3 volunteers' ERIC-PCR fingerprints of index fingers matched that took from desk top of personal office table, and other 7 volunteers' ERIC-PCR fingerprints did not match perfectly with that took from desk top of personal office table, but had at least one similar band for both.
Conclusions:
The bacteria on index finger shows individual specificity, which on mobile phone touching screen and personal desktop may be a new biological sample of forensic identification.
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